﻿<blockquote class="extDef">
NOTE&nbsp; Definition according to ISO/CD 10303-41:1992<br>
A context dependent unit is a unit which is not related to the SI system.</blockquote>

<blockquote class="note">
NOTE&nbsp; The number of parts in an assembly is a physical quantity measured in units that may be called "parts" but which cannot be related to an SI unit.
</blockquote>

<blockquote class="note">
NOTE&nbsp; Corresponding ISO 10303 name: context_dependent_unit, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class="history">
HISTORY&nbsp; New entity in IFC1.5.1.
</blockquote>